Maid of the Mist
Northern Gallatin
Code
HS-N-R4-D3.5-O
Elevation
9900
Aspect
SE
Aspect Range
E-S
Latitude
45.41640
Longitude
-110.97000
Notes
Skiers saw these deep slabs in Maid of the Mist in Hyalite on 2/21/20. Doug Chabot went to the site on the 2/22.
The avalanches were big and deep. They ran on the facets/ depth hoar near the ground. The slide (1&2) ran to their maximum runout.
Aspect : South to East
Elevation: 9900'
Slope Angle: estimated 45+ degrees at the steepest with average of 40 degrees.
Using Google Earth
Crown: 9930'
Toe of Debris: 9316' with a measured Alpha Angle of 16 degrees
- Latitude: 45°24'49.65"N
- Longitude: 110°58'49.04"W
Using picture "4 avalanches..." as reference:
- was 300' wide, 6-8 feet deep
- 1300' wide; it ran from east to south aspect ; was 10-12 feet deep; ran 2150' slope distance,
- was 150' wide, 450' slope distance, 4-5 feet deep
- was 250' wide and had a measured Alpha Angle of 26 degrees, 4-5 feet deep and ran 775 slope distance.
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
4
D size
3.5
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
120.0 inches
Vertical Fall
600ft
Slab Width
1300.00ft
Weak Layer Grain type
Depth Hoar
Images
Attached Videos
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year